package com.sqnu.dashe.filter;

import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.annotation.JsonAlias;
import com.sqnu.dashe.common.BaseContext;
import com.sqnu.dashe.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;

/**
 * @author mmy
 * @create 2023-06-05 9:07
 * @description
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1、获取本次请求的uri
        String requestURI = request.getRequestURI();


        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg",
        };
        log.info("拦截到请求：{}",request.getRequestURI());
        //2、判断本次请求是否要处理
        boolean check = check(urls, requestURI);
        //3、如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4、判断登录状态，如果以登录，则直接放行
        if (request.getSession().getAttribute("employee")!= null) {
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));

            Long employeeId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(employeeId);

            filterChain.doFilter(request,response);
            return;
        }
        //4-2、判断登录状态，如果以登录，则直接放行
        if (request.getSession().getAttribute("user")!= null) {
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        //5、如果未登录则直接返回未登陆结果,通过输出流的方式，向客户端页面响应数据
        log.info("用户未登录");

        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
